I used the launcher icon generator link below to create my own launcher icon:
https://romannurik.github.io/AndroidAssetStudio/
Then I download the zip package. Unzip it into the right directory and overwrite all the drawable-*/ic_launcher.png correctly with my launcher images.
The problem is that the launcher icon is small compared to other icons on my phone. Look at the image on the far right below:
How do I enlarge it's dimensions in android studio ?
Just edit those Mipmaps and enlarge them a bit.
Use this website, upload any of your icon (for better results use the larger one), edit sizes of every icon like you could multiply every icon's width and height by 1.25 and put them.
For Example -
192x192 => 240x240 [xxxhdpi]
144x144 => 180x180 [xxhdpi]
96x96 => 120x120 [xhdpi]
72x72 => 90x90 [hdpi]
48x48 => 60x60 [mdpi]
.
I used this way and it worked great.
Also, you could use photoshop but by the time photoshop will open, your work will be done.
And Downvotes are because of something you could do by yourself or something you could find on google or something hard enough to answer. Don't panic, even I can't post questions because I've more downvotes than upvotes on my questions.
Also, don't forget to name all the files
ic_launcher.png
and store them in respective mipmap folder.